Rigrodsky & Long, P.A. announces that it is investigating potential legal claims against the board of directors of Zoltek Companies, Inc. (“Zoltek” or the “Company”) (NASDAQ GS: ZOLT) regarding possible breaches of fiduciary duties and other violations of law related to the Company’s entry into an agreement to be acquired by Toray Industries, Inc. (“Toray”) in a transaction valued at approximately $584 million.

Under the terms of the agreement, public shareholders of Zoltek will receive $16.75 per share in cash for each share of Zoltek they own.

The investigation concerns whether Zoltek’s board of directors failed to adequately shop the Company and obtain the best possible value for Zoltek’s shareholders before entering into an agreement with Toray.

If you own the common stock of Zoltek and purchased your shares before September 26, 2013, if you have information or would like to learn more about these claims, or if you wish to discuss these matters or have any questions concerning this announcement or your rights or interests with respect to these matters, please contact Seth Rigrodsky or Gina Serra at Rigrodsky & Long, P.A., 825 East Gate Boulevard, Suite 300, Garden City, New York 11530, by telephone at (888) 969-4242; by e-mail to info@rl-legal.com, or at: http://www.rigrodskylong.com/investigations/zoltek-companies-inc-zolt.